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Identification and validation of three novel S. hominis AIPs. The amino acid sequence and thiolactone structure of S. hominis AIP-II (A), AIP-IV (B), and AIP-V (C) were solved and confirmed using MS-MS analysis. Characteristic y ions are listed for each AIP. The calculated mass of the protonated peptide (Calc.) is shown beneath each structure in comparison to the experimental mass (Exp.) and mass error.
